Hiding HDRI in Rhino Render

I would like to have and HDR for lighting and reflections in my models. However, I do not want the HDRI to show in the background render. How can I accomplish this?

Thanks in advance.

Unfortunately, I don’t think this is possible right now. The good news is that this separation of HDR reflections from visible background has already been hooked up and is on by default for Rhino Render in the Rhino for Windows WIP which should become v6. Eventually these features should migrate to Rhino for Mac but I can’t say when this is likely. When rendering plugins are available for Rhino for Mac, you’ll also have other options that handle this as well.

In the meantime, make a planar surface for the ground and then use the Bend command to bend it behind the model like a backdrop in a photo studio if you’re angle of view is set low enough to see the background.

Thanks for the reply, Brian!